Feeding device



March 29, 1938. v w, KLEMM 2,112,341

FEEDING DEVICE Filed Feb. 18, 1937 2 Sheets-Sheet 1 March 29, 1938.

w. G. KLEMM 2,112,341

FEEDING DEVI CE I Filed Feb. 18, 1937 2 heets-Sheet 2 Patented Mar. 29, 1938 UNITED STATES 2,112,341 rnaome DEVICE William G. Klemm,

Speed-O-Print corporation of Illinois Chicago, Corporation,

111., 'assignor to Chicago, Ill., a

Application February 18, 1937, Serial No. 126,395 4 Claims. (of! 211-42) This invention relates to improvements in various details of a feeding device and related mechanism suitable for a stencil duplicating machine.

One of the objects of this invention is to provide an improved precision means for regulating the timing of the stroke of certain automatic feed arms, so that paper may be fed with great uniformity and the impressions on one sheet will be substantially in register with that of another.

Another object is to provide a paper backstop designed to aid in feeding paper from a uniform distance and 'which is adjustable to accommodate lengths of sheets down to the size of a post card, and yet not interfere with the operation of automatic feed mechanism. I r

Another object relates to details of improved side'guides for holding the paper on the feed table. Another object relates to improvements in the feed shoe whereby a good paper gripping surface can be maintained at all times and its efliciency maintained,

Other objects relate to economy of construction and arrangement of parts which will be apparent from a consideration of the lowing description, wherein:

Figure 1 is a side view of a stencil duplicating machine embodying my improvements, and

Figure 2 is a perspective view of a portion thereof, showing the details of the feed arm stroke varying mechanism.

Figure 3 is a fragmentary section on the line 3-3 of Figure2.

Figure 4,is a fragmentary longitudinal section 5 through Figure 1, showing the paper backstop and feed arm in different positions.

Figure 5 is a plan view of one of the side paper guides.

Figure 6 is a perspective detail of the feed shoe.

Figure 'l is a perspective detail of the paper backstop.

Figure 8 is a perspective detail of the paper side guides, and further shows .the slot in which they move on the feed table.

Referring to the drawings It indicates the side frames of a conventional stencil duplicating machine, having a drum .ll whose shaft I2 is jour-,

'naled in said frame. Locked to one shaft is the. lever l3 which rotates with it and 50 imparts motion to the link I4 pivoted to the end of the shaft as at l5. Pivoted to the link. I4 is the threaded block it which receives the screw H which is retained by the lever l3 in some suitable manner, as for example at l8, and can be 5 manipulated by means '0? the knurled nut I9.

. moderately sized gripping surface.

slot 23 through the ears drawings and folunder ordinary end of the 'a pile of sheets, side guides extending nally of said table and transversely In this way, by turning the nut l9 precision timing adjustment of the feeding stroke, transmitted through the reciprocating link 20, vertical arms 2|, and transverse pivoted bar 22 to the feed arm 23 and feed shoe 24 is obtained.

The feed shoe 24 is preferably formed of an angularly cross sectional bar so as to present a Over the ends of the feedshoe are fitted tubular sections 25 of suitable friction material such as rubber. Due to the fact that the shoe does not rotate, only that portion of the rubber tube on the lowermost face of the shoe will receive wear, and as this surface from use, the tubing may be rowith :the structure shown, the gripping surface may be renewed five more times.

A pair of side guides 26 are positioned on the feed table 21 and may laterally move thereon to accommodate varying widths of paper by means of the bolts 28 extending through the transverse 30 to the knurled nuts 3|." Extending through an opening in the side guides are friction members 32, preferably in the form of rubber. These friction members are affixed to the spring bars 33 secured tothe outer sideof the guide. A bolt 34 affixed to the outer side of the guide extends through spring bar 33 and by means of the nut 35 refined adjustments for holding the paper stack 36 may be made.

TA backstop 3'! adjustable in the longitudinal slot 38 by means of the bolt 39 and nut 40, is provided with a curved face 4|, to compensate for the varying distances of travel of the sheets on the stack 36. This backstop may be adjusted to accommodate varying lengths of sheets down to post card size. However, at this position of adjustment the backstop, due to its required height for supportinga conventional stack, would circumstances interfere with the movement of the feed arm 23 or the weight 42 which it sometimes carries. For this reason I have formed my backstopot two upstanding portions 43 formed integral with the base portion 31 and providing sufflcient so that the feed arm may reciprocate uninter-- ruptedly at any operative position of the back- What I claim is:

1. In combination with a rotary duplicating machine, a feed table therefor adapted to support longitudiadjustable thereon to substantially engage the sides of said pile, friction means extending through an aperture in said side guides and adapted to engage said table and carrying adapted to reciprocate on a Ieed'arm and shoe 3. Im conibinatin with a rotary duplicating machine, q feed table adapted to gupport a pile 61 sheets, a feed y oke extending ahoie and acrdss 

